Bump vaadin-server from 7.7.10 to 7.7.24
Bump vaadin-server from 7.7.10 to 7.7.24

Bumps vaadin-server from 7.7.10 to 7.7.24.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
sebgymn/flotcharts,sebgymn/flotcharts,sebgymn/flotcharts